io.trino.sql.analyzer.WindowFunctionValidator Maven / Gradle / Ivy
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.trino.sql.analyzer;
import io.trino.Session;
import io.trino.metadata.Metadata;
import io.trino.metadata.ResolvedFunction;
import io.trino.sql.tree.DefaultExpressionTraversalVisitor;
import io.trino.sql.tree.FunctionCall;
import static io.trino.spi.StandardErrorCode.MISSING_OVER;
import static io.trino.spi.function.FunctionKind.WINDOW;
import static io.trino.sql.analyzer.SemanticExceptions.semanticException;
import static java.util.Objects.requireNonNull;
class WindowFunctionValidator
extends DefaultExpressionTraversalVisitor
{
private final Session session;
private final Metadata metadata;
public WindowFunctionValidator(Session session, Metadata metadata)
{
this.session = session;
this.metadata = metadata;
}
@Override
protected Void visitFunctionCall(FunctionCall functionCall, Analysis analysis)
{
requireNonNull(analysis, "analysis is null");
// pattern recognition functions are not resolved
if (!analysis.isPatternRecognitionFunction(functionCall)) {
ResolvedFunction resolvedFunction = analysis.getResolvedFunction(functionCall);
if (resolvedFunction != null && functionCall.getWindow().isEmpty() && resolvedFunction.getFunctionKind() == WINDOW) {
throw semanticException(MISSING_OVER, functionCall, "Window function %s requires an OVER clause", resolvedFunction.getSignature().getName());
}
}
return super.visitFunctionCall(functionCall, analysis);
}
}